Leather is leather, while some other areas are non-leather (Maztex) - from a 2014 article:
Mazda spokesman Steve Maciver said there was a simple reason behind the use of *Maztex* man-made replica materials.
*We use Maztex because ultimately it is a harder wearing material than leather,* he said.
*It*s for durability.
*The stuff that your body is in contact with is real leather.*
https://www.drive.com.au/motor-news/are-your-car-seats-actual-leather-20140330-35sre
Indeed